Hands down...The Otherness. While not a "person" the concept of The Otherness is one of the coolest I have ever read in a series of fiction.
If I could I would pledge my alligence to The Otherness...or maybe I'll just make a $5 donation.
Major K
"He guards the sleep of his pauper master as if he were a Prince." George Graham Vest
"We are alone, absolutely alone on this chance planet: and, amid all the forms of life that surround us, not one, excepting the dog, has made an alliance with us." - Maurice Maeterlinck